/* ============================================================
   Media Gallery · 主题系统 + 响应式样式
   ============================================================ */

/* ---------- CSS 变量（亮色模式 = 默认） ---------- */
:root {
    --bg-gradient: linear-gradient(135deg, #f0f4ff, #e9d5ff, #f0f4ff);
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;

    --glass-bg: rgba(255, 255, 255, 0.55);
    --glass-border: rgba(255, 255, 255, 0.40);
    --glass-shadow: 0 8px 32px rgba(148, 163, 184, 0.15);

    --btn-bg: rgba(0, 0, 0, 0.04);
    --btn-border: rgba(0, 0, 0, 0.06);
    --btn-hover-bg: rgba(0, 0, 0, 0.08);
    --btn-hover-border: rgba(0, 0, 0, 0.12);

    --card-bg: rgba(255, 255, 255, 0.50);
    --card-border: rgba(0, 0, 0, 0.06);
    --card-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
    --card-hover-shadow: 0 20px 60px rgba(0, 0, 0, 0.12);

    --badge-bg: rgba(255, 255, 255, 0.70);
    --badge-border: rgba(0, 0, 0, 0.08);

    --dropzone-border: rgba(0, 0, 0, 0.12);
    --dropzone-hover-border: rgba(168, 85, 247, 0.35);
    --dropzone-hover-bg: rgba(168, 85, 247, 0.04);

    --progress-bg: rgba(0, 0, 0, 0.06);
    --progress-gradient: linear-gradient(90deg, #a855f7, #ec4899);

    --spinner-border: rgba(0, 0, 0, 0.10);
    --spinner-accent: #a855f7;

    --toast-bg: rgba(255, 255, 255, 0.95);
    --toast-border: rgba(0, 0, 0, 0.10);
    --toast-shadow: 0 10px 40px rgba(0, 0, 0, 0.12);
    --toast-text: #1e293b;

    --modal-overlay: rgba(0, 0, 0, 0.40);

    --particle-color: rgba(168, 85, 247, 0.15);

    --scrollbar-thumb: rgba(0, 0, 0, 0.12);
    --scrollbar-hover: rgba(0, 0, 0, 0.20);

    --card-overlay-dark: linear-gradient(to top, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0.3) 40%, transparent 60%);
    --card-info-text: #1e293b;
    --card-info-sub: #64748b;

    --list-item-bg: rgba(0, 0, 0, 0.02);
    --list-item-border: rgba(0, 0, 0, 0.04);
    --list-item-hover-bg: rgba(0, 0, 0, 0.04);

    --filter-btn-color: #64748b;
    --filter-btn-active-bg: rgba(168, 85, 247, 0.12);
    --filter-btn-active-color: #7c3aed;

    --view-btn-color: #94a3b8;
    --view-btn-active-bg: rgba(0, 0, 0, 0.06);
    --view-btn-active-color: #1e293b;
}

/* ---------- 暗色模式 ---------- */
.dark {
    --bg-gradient: linear-gradient(135deg, #0f172a, #2e1065, #0f172a);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-inverse: #1e293b;

    --glass-bg: rgba(255, 255, 255, 0.06);
    --glass-border: rgba(255, 255, 255, 0.10);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);

    --btn-bg: rgba(255, 255, 255, 0.06);
    --btn-border: rgba(255, 255, 255, 0.08);
    --btn-hover-bg: rgba(255, 255, 255, 0.12);
    --btn-hover-border: rgba(255, 255, 255, 0.20);

    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.08);
    --card-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
    --card-hover-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);

    --badge-bg: rgba(0, 0, 0, 0.5);
    --badge-border: rgba(255, 255, 255, 0.10);

    --dropzone-border: rgba(255, 255, 255, 0.20);
    --dropzone-hover-border: rgba(168, 85, 247, 0.60);
    --dropzone-hover-bg: rgba(168, 85, 247, 0.08);

    --progress-bg: rgba(255, 255, 255, 0.10);
    --progress-gradient: linear-gradient(90deg, #a855f7, #ec4899);

    --spinner-border: rgba(255, 255, 255, 0.10);
    --spinner-accent: #a855f7;

    --toast-bg: rgba(30, 30, 50, 0.95);
    --toast-border: rgba(255, 255, 255, 0.10);
    --toast-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    --toast-text: #f1f5f9;

    --modal-overlay: rgba(0, 0, 0, 0.70);

    --particle-color: rgba(255, 255, 255, 0.12);

    --scrollbar-thumb: rgba(255, 255, 255, 0.12);
    --scrollbar-hover: rgba(255, 255, 255, 0.22);

    --card-overlay-dark: linear-gradient(to top, rgba(0,0,0,0.88) 0%, rgba(0,0,0,0.3) 40%, transparent 60%);
    --card-info-text: #ffffff;
    --card-info-sub: rgba(255, 255, 255, 0.60);

    --list-item-bg: rgba(255, 255, 255, 0.03);
    --list-item-border: rgba(255, 255, 255, 0.05);
    --list-item-hover-bg: rgba(255, 255, 255, 0.06);

    --filter-btn-color: rgba(255, 255, 255, 0.50);
    --filter-btn-active-bg: rgba(168, 85, 247, 0.20);
    --filter-btn-active-color: #c084fc;

    --view-btn-color: rgba(255, 255, 255, 0.40);
    --view-btn-active-bg: rgba(255, 255, 255, 0.08);
    --view-btn-active-color: #ffffff;
}

/* ---------- 全局 ---------- */
* { box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-gradient);
    color: var(--text-primary);
    transition: background 0.4s ease, color 0.4s ease;
    min-height: 100vh;
}

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-hover); }

/* ---------- 毛玻璃面板 ---------- */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    transition: background 0.4s ease, box-shadow 0.4s ease;
}

/* ---------- 玻璃按钮 ---------- */
.glass-btn {
    background: var(--btn-bg);
    border: 1px solid var(--btn-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    color: var(--text-secondary);
}
.glass-btn:hover {
    background: var(--btn-hover-bg);
    border-color: var(--btn-hover-border);
    color: var(--text-primary);
}

/* ---------- 粒子背景 ---------- */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}
.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--particle-color);
    border-radius: 50%;
    animation: float linear infinite;
}
@keyframes float {
    0% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(-10vh) rotate(720deg); opacity: 0; }
}

/* ---------- 拖拽上传区 ---------- */
.drop-zone {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    border-color: var(--dropzone-border) !important;
}
.drop-zone::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.04), rgba(236, 72, 153, 0.04));
    opacity: 0;
    transition: opacity 0.3s ease;
}
.drop-zone:hover::before,
.drop-zone.drag-over::before { opacity: 1; }

.drop-zone:hover {
    border-color: var(--dropzone-hover-border) !important;
    transform: translateY(-1px);
}
.drop-zone.drag-over {
    border-color: var(--dropzone-hover-border) !important;
    background: var(--dropzone-hover-bg);
    transform: scale(1.01);
}

.upload-icon {
    animation: float-icon 3s ease-in-out infinite;
}
@keyframes float-icon {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

/* ---------- 进度条 ---------- */
.progress-bar {
    position: relative;
    overflow: hidden;
    background: var(--progress-bg);
}
.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.25), transparent);
    animation: shimmer 2s infinite;
}
@keyframes shimmer {
    100% { left: 200%; }
}
#progressFill {
    background: var(--progress-gradient);
}

/* ---------- 加载动画 ---------- */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--spinner-border);
    border-top-color: var(--spinner-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ---------- 媒体卡片 ---------- */
.media-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 1rem;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    aspect-ratio: 4/3;
    box-shadow: var(--card-shadow);
}
.media-card:hover {
    transform: translateY(-6px) scale(1.02);
    border-color: rgba(168, 85, 247, 0.3);
    box-shadow: var(--card-hover-shadow);
}

.media-card .card-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}
.media-card:hover .card-thumb {
    transform: scale(1.08);
}

.media-card .card-overlay {
    position: absolute;
    inset: 0;
    background: var(--card-overlay-dark);
    opacity: 0;
    transition: opacity 0.4s ease;
}
.media-card:hover .card-overlay { opacity: 1; }

.media-card .card-info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1rem;
    transform: translateY(10px);
    opacity: 0;
    transition: all 0.4s ease;
}
.media-card:hover .card-info {
    transform: translateY(0);
    opacity: 1;
}

.media-card .card-info .card-name {
    color: var(--card-info-text);
}
.media-card .card-info .card-meta {
    color: var(--card-info-sub);
}

.media-card .card-type-badge {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    padding: 0.25rem 0.65rem;
    background: var(--badge-bg);
    backdrop-filter: blur(8px);
    border-radius: 0.5rem;
    font-size: 0.7rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    border: 1px solid var(--badge-border);
    color: var(--text-secondary);
}

/* ---------- 视频播放按钮覆盖 ---------- */
.video-play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 3.5rem;
    height: 3.5rem;
    background: rgba(168, 85, 247, 0.30);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.25);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    transition: all 0.3s ease;
}
.media-card:hover .video-play-icon {
    transform: translate(-50%, -50%) scale(1.15);
    background: rgba(168, 85, 247, 0.50);
}

/* ---------- 筛选按钮 ---------- */
.filter-btn {
    color: var(--filter-btn-color);
    transition: all 0.3s ease;
}
.filter-btn:hover { color: var(--text-primary); }
.filter-btn.active {
    background: var(--filter-btn-active-bg);
    color: var(--filter-btn-active-color);
}

.view-btn {
    color: var(--view-btn-color);
    transition: all 0.3s ease;
}
.view-btn:hover { color: var(--text-primary); }
.view-btn.active {
    background: var(--view-btn-active-bg);
    color: var(--view-btn-active-color);
}

/* ---------- 列表视图 ---------- */
.list-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: var(--list-item-bg);
    border: 1px solid var(--list-item-border);
    border-radius: 0.75rem;
    transition: all 0.3s ease;
    cursor: pointer;
}
.list-item:hover {
    background: var(--list-item-hover-bg);
    border-color: var(--card-border);
}
.list-item .list-thumb {
    width: 3.5rem;
    height: 2.5rem;
    object-fit: cover;
    border-radius: 0.5rem;
    flex-shrink: 0;
    background: var(--card-bg);
}

/* ---------- Toast ---------- */
.toast {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    border-radius: 0.75rem;
    background: var(--toast-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--toast-border);
    box-shadow: var(--toast-shadow);
    animation: slideIn 0.3s ease;
    min-width: 260px;
    color: var(--toast-text);
}
@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}
.toast-success { border-left: 3px solid #22c55e; }
.toast-error { border-left: 3px solid #ef4444; }
.toast-info { border-left: 3px solid #a855f7; }

/* ---------- 预览 Modal ---------- */
#previewModal {
    animation: fadeIn 0.3s ease;
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
#previewModal img,
#previewModal video {
    max-width: 100%;
    max-height: 75vh;
    border-radius: 0.75rem;
}

/* ---------- 上传列表项动画 ---------- */
.upload-item {
    animation: listSlideIn 0.3s ease;
}
@keyframes listSlideIn {
    from { transform: translateY(-10px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* ---------- Header 统计文字 ---------- */
.header-stats {
    color: var(--text-muted);
}

/* ---------- 颜色辅助类 ---------- */
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-primary { color: var(--text-primary); }

/* ============================================================
   响应式设计
   ============================================================ */

/* 平板竖屏 & 大手机 */
@media (max-width: 768px) {
    .glass-panel {
        border-radius: 1rem !important;
        padding: 1rem !important;
    }

    header.glass-panel {
        padding: 0.75rem 1rem !important;
    }
    header .header-title {
        font-size: 1.05rem;
    }
    header .header-sub {
        font-size: 0.65rem;
    }

    .drop-zone {
        padding: 2rem 1.5rem !important;
    }
    .drop-zone .upload-icon i {
        font-size: 2.5rem !important;
    }
    .drop-zone p {
        font-size: 0.9rem !important;
    }

    /* 筛选栏 + 视图按钮折叠成两行 */
    .gallery-toolbar {
        flex-direction: column;
        align-items: flex-start !important;
        gap: 0.5rem;
    }
    .gallery-toolbar .toolbar-left {
        width: 100%;
    }
    .gallery-toolbar .toolbar-right {
        width: 100%;
        justify-content: space-between;
    }

    .media-card {
        aspect-ratio: 4/3;
    }
    /* 手机上 hover 等效 tap，显示 overlay */
    .media-card .card-overlay { opacity: 0.55; }
    .media-card .card-info {
        transform: translateY(0);
        opacity: 1;
    }
}

/* 小手机 */
@media (max-width: 480px) {
    .max-w-7xl {
        padding-left: 0.5rem !important;
        padding-right: 0.5rem !important;
    }

    .drop-zone {
        padding: 1.5rem 1rem !important;
    }
    .drop-zone .upload-icon i {
        font-size: 2rem !important;
    }
    .drop-zone p {
        font-size: 0.85rem !important;
    }

    /* 网格 1列 -> 2列 */
    #mediaGrid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 0.5rem !important;
    }

    .media-card {
        border-radius: 0.75rem;
        aspect-ratio: 4/3;
    }
    .media-card .card-type-badge {
        font-size: 0.6rem;
        padding: 0.15rem 0.45rem;
        top: 0.4rem;
        left: 0.4rem;
    }

    .list-item {
        padding: 0.5rem 0.75rem;
        gap: 0.65rem;
    }
    .list-item .list-thumb {
        width: 2.5rem;
        height: 1.75rem;
    }
    .list-item p {
        font-size: 0.8rem !important;
    }

    .filter-btn, .view-btn {
        font-size: 0.75rem !important;
        padding: 0.35rem 0.6rem !important;
    }

    .toast {
        min-width: auto;
        max-width: 90vw;
        font-size: 0.85rem;
        padding: 0.6rem 1rem;
        right: 0.5rem;
        bottom: 0.5rem;
    }

    /* Modal 手机适配 */
    #previewModal .relative {
        margin: 0 0.5rem !important;
    }
    #closeModal {
        top: -2.5rem !important;
        right: 0 !important;
    }
}

/* 大屏幕优化 */
@media (min-width: 1280px) {
    #mediaGrid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* 预览 Modal 内容区域自适应 */
#modalContent {
    max-height: 75vh;
}
#modalContent video {
    max-height: 75vh;
    width: auto;
}